Externally mounted lock



April 6, 1955 R. L. DAUENBAUGH 3,176,487

EXTERNALLY MOUNTED LOCK Filed Jan. 15, 1963 United States Patent Ofitice 3,176,437 EXTERNALLY P/EQUNTED LQCK The present invention relates to a novel locking device.

and more particularly to a novel externally mounted lock which only requires one mounting screw and-an easily mounted strike to provide-a lock which may be utilized on a refrigerator or similar device.

Presently available lock assemblies require substan tial time and effort to mount on a door and usually require operations to be performed at both the interior and exterior sides of the door. The present invention, on the other hand, requires only two openings to be drilled from the exterior side of the door and the use of one mounting screw having a slotted head machined. to allow clockwise rotation of the screw but preventing counterclockwise rtation required to remove the screw.

An important object of'the present invention is the pro-- vision of a lock assembly which is mounted on the edge or exterior surface of a door with a minimum of mounting operation. Only two openings are required to be drilled in the door; a large opening adapted to receivev the lock cylinder and a small opening to receive the single mounting screw utilized to secure the lock to the door.

Another important object of the present invention is the provision of an externally mounted lock having an externally mounted bolt which is rotatable through an arc of approximately 90 between an-inactive position and an active position where the bolt engages a suitable strike member. The bolt is mounted to rotate with the rotatable portion of a tumbler lock in thelock assembly relative to the lock cylinder and to engage in the locking position a suitable strike member.

A further object of the present invention is the provision of a lock assembly having a cylinder and integral mounting plate, a tumbler lock received with the cylinder, a bolt mounted in front of saidcylinder' and held in proper position by a flanged outer end or face plate of the tumbler lock, anda retainer plate and stop member mounted on the rotatable plug of the tumbler lock ex-. tending through the cylinder and cooperating with a longitudinal projection on the periphery of the cylinder.

The present invention also comprehends the provision of a rigid mounting arrangementfor the lock in the door or other structure. The lock cylinder includes a annular groove adjacent the integral mounting plate adapted to receive a portion of the peripheral edge of the door defined by the opening of the cylinder. When the cylinder is inserted in the opening therefor, it must be shifted laterally'to align the opening in the mounting plate with the opening in the door to receive the single mounting screw. Thus the annular groove engages a portion of the edge of the opening to preventwithdrawal of the lock cylinder.

Further objects are to provide a construction 'of maximum simplicity, eiliciency, economy and ease of assembly and operation, and such further objects, advantages and capabilities as will later more fully appear and are inherently possessed thereby.

In the drawing:

FEGURE 1 is a front elevational View of the lock assembly of the present invention installed upon the edge of a refrigerator door with a portion of the lip of the cabinet broken away to more clearly show the mounting of the lock.

FIG. 2 is a top plan view of a refrigerator door with the enclosure or cabinet shown partially incross section and the lock mounted on the edge of the door.

FIG. 3 is a rear elevational view of the lock cylinder and mounting plate on theedge of the door.

FIG. 4 is a front elevationalview of the lock cylinder and integral mounting plate.

FIG. 5 is an end elevational view-of the locking bolt.

FIG. 6 is a front elevational View of the bolt.

FIG. 7 is a front elevational view showing the construction of the strike. a

FIG. 8 is an end elevational view-of the strike.

FIG. 9 is a bottom plan view of the strike.

FIG. 10 is a front elevational view of the retainer plate and stop.

FIG. 11 is an end elevational View of the retainer plate and stop.

Referring more particularly to the disclosure in the drawing and to the novel illustrative embodiment therein shown, FIG. 1 discloses an externally, mounted lock 10. on the edge of the-door 11 of a refrigerator cabinet of enclosure 12. As seen in FIG. 2, the vdoor 11 has suitable sealing means such as a flexible. gasket 13 for sealing the refrigerator from undue loss or leakage of the cold temperatures created therein.

The externally mounted. lock 10 includes a lock cylinder 14 with anintegral mounting plate 15' formed at the outerend of the cylinder. The mounting plate extends radially outwardly of the cylinder 14 for the entire circumference thereof with a lateral extension 16 having an opening 17 for a metal screw 18 or like suitable mounting means. When the lock is mounted on thedoor the rear surface 19 of the mounting plate 15 contacts the outer surface or edge of the door 11.

The cylinder 14 has an opening 21 drilled therethrough and a plurality of circumferentially equally spaced slots 22 are formed in the inner wall of the cylinder adapted to receive complementary ribs formed on the exterior surface of a tumbler lock 23 which is inserted-into the cylinder. The inner end of the cylinder is counterbored to form a shoulder for the reception of an O-ring 24. A longitudinally extending projection 25 is formed on the periphery of the cylinder and adapted to cooperate with a retainer plate and stop 26. The plate 26 is generally circular with a centrally located square openiug27 to receive the complementary end 28 of the rotatable plug on the tumbler lock. An arcuate slot 29 is formed on the periphery of the plate of an are greater than but when cooperating with the projcctionZS limiting'rotation of the plug to approximately 90. The end of the plug 28 is upset to secure the tumbler lock 23 within and the retainer plate andstop 26 on the cylinder 14.

A bolt 31 is mounted to slidably contact the outer surface of the mounting plate 15 and includes a generally circular body portion 32 having a centrallylocated'opening 33 adapted to receive the tumbler lock 23 and an arcuate recess 34in the 'edge'of the opening 33 adapted to receive a complementary projection 40 on the periphery of the rotatableportion of thetumbler lock so that the bolt 31 will rotate therewith. The outer endof the tumbler lock 23 has an enlarged end. or face plate 35 secured to the rotatable portion of the lock and. of a diameter greater than that of the opening 33 in the'bolt to secure the bolt to the lock cylinder. The bolt has an offset outwardly extending arm 36 terminating in a lateral locking projection 37 to form a hook portion which cooperates with a strike 38 mounted on the cabinet or enclosure 12. The strike includes an elongated base plate 3 having longitudinally disposed elongated openings 41 adjacent the ends thereof for the reception of suitable mounting means such as the screws 42, the openings permitting longitudinal adjustment of the strike plate. The base is provided with an arm or extension 43 terminatirw Patented Apr. 6, 1965 in a laterally extending hooked end 44; said arm and laterally extending end forming a projection having looking engagement with the hook portion 37 f the bolt 31.

When the bolt 31, lock cylinder 14, tumbler lock 23 and retainer plate and stop 26 are assembled and the end ofthe rotatable plug 28 upset to secure these members together, the lock is ready for mounting on the edge or exterior surface of a door of a refrigerator or the like. A large hole to accommodate the lock cylinder and a small opening at approximately 45 below the horizontal andtoward the interior side of the door are drilled in the edge ofthe door 11 (see FIG. 1.) The spacing between the centers of. the holes in the door is slightly smaller than the distance between the axis of the lock cylinder 14 and the center of the opening 17 in the mounting.

plate 15. This difference in distances is approximately equal to the depth of anannular groove .45 machined in the lock cylinder '14 adjacent the mounting plate 15. The width of this groove 45 is such as to accommodate the thickness of the edge of the opening in the door 11.

The cylinder 14 is inserted in the larger of the two openings and the lock is then moved laterally away from the smaller opening to align the opening 17 with its complementary opening in the door and have the peripheral edge of the larger opening in the door received in the groove 45. The screw 18 is then turned clockwise to engage the door 11 and secure the mounting plate 15 thereto. The head of the screw is slotted as at 46, but opposite areas have been machined away to form camming areas as at 47 to remove any driving surface for counterclockwise rotation. Thus, once the screw is inserted in the door, any rotation in the opposite direction will cause the, driver to ride. up the carnming areas 47 so that the screw cannot be withdrawn. This mounting provides a simple yet permanent external mounting for the lock 10.

The strike 38 is then mounted on the enclosure or cabinet 12 so that the hook portion of the bolt 31 engages the arm 43 and its lateral end 44 to lock the door. A suitable key 48 operates the tumbler lock 23 to rotate the bolt 31 between the locked and unlocked positions with the key being capable of withdrawal in either position. 7

While this externally mounted lock has been shown and described as being advantageously applicable to mounting on the edge of arefrigerator, the lock can be mounted on the exterior surface of a door, and it is not my desire or intent to unnecessarily limit the scope or the utility of the improved features by virtue of this illustrative embodiment.

Having thus disclosed the invention, I claim:

1. An externally mounted lock for the door of an enclosure and having locking engagement with a strike on the enclosure, comprising a lock cylinder extending into the door, a mounting plate integral with the cylinder contacting the outer surface of the door, a bolt slidably contacting the mounting plate and mounted for rotation relative thereto, a tumbler lock mounted within the cylinder and retaining the bolt on the mounting plate and a single mounting screw insertable into aligned openings in the mounting plate and the door, said bolt having locking engagement with the strike on the enclosure.

2. An externally mounted lock as set forth in claim 1, in which said mounting screw has a slotted headwith opposite portions of the head removed to prevent retraction of the screw.

3. An externally mounted lock as set forth in claim 1, including a retainer plate and stop secured to the inner end of said tumbler lock and limiting movement of said bolt to an arc of approximately 90.

4. An externally mounted lock as set forth in claim 1, in which an annular groove is formed in the cylinder adjacent the mounting plate of a Width adapted to receive the peripheral edge of the door and prevent ready removal of the lock when mounted on the door.

5. An externally mounted lock for a door or the like comprising a lock cylinder extending into the door, a mounting plate integral with the cylinder and abutting the exterior of the door with a lateral extension having an offset opening for a mounting screw, a bolt slidably engaging and rotatably mounted relative to said mounting plate and having locking engagement with a suitable strike, and a mounting screw received in said ofiset opening capable of being rotated clockwise to anchor the mounting plate to the door but incapable of being rotated counter-clockwise to withdraw the screw.

6. An externally mounted lock for the edge of a door of an enclosure, comprising a lock cylinder extending into the edge of the door, a mounting plate integral with said lock cylinder and limiting the depth of insertion of said cylinder in the door, said mounting plate having a laterally offset opening thereinadapted to receive a mounting screw, a bolt slidably contacting said lock cylinder and mounted for rotation relative thereto, a tumbler lock mounted within said cylinder and having a face plate abutting and retaining the bolt on the mounting plate, a

rotatable plug on said tumbler lock extending from the rear of said lock cylinder, a retainer plate and stop so cured to and rotatable with said plug, means to limit movement of the retainer plate and stop, and a mounting screw for said mounting plate having a slotted head with portions of the head, removed to prevent withdrawal of the screw by the use of a suitable driver, said bolt rotating With the tumbler lock upon insertion of a proper key.

7. An externally mounted lock as set forth in claim 6, in which said means to limit movement of said retainer plate and stop includes an arcuate slot on the periphery of said plate and a longitudinally extending projection on the periphery of said lock cylinder and extending into said slot.

8. An externally mounted lock as set forth in claim 6,

in which said lock cylinder includes an annular groove adjacent to the mounting plate and of a width suflicient to receive a peripheral edge of the door and prevent removal of the lock cylinder therefrom.

9. An externally mounted lock as set forth in claim 6, in which the bolt has an opening to receive the tumbler lock, said opening having an arcuate recess receiving a complementary projection on the rotatable plug so that the bolt rotates therewith.

References Cited by the Examiner UNITED STATES PATENTS 1,506,500 8/24 Ripamonti et al. 8545 2,097,504 11/37 Wells -379 2,255,402 9/41 Vile 70-139 FOREIGN PATENTS 175,512 7/33 Austria.

M. HENSON WOOD, In, Primary Examiner. 

1. AN EXTERNALLY MOUNTED LOCK FOR THE DOOR OF AN ENCLOSURE AND HAVING LOCKING ENGAGEMENT WITH A STRIKE ON THE ENCLOSURE, COMPRISING A LOCK CYLINDER EXTENDING INTO THE DOOR, A MOUNTING PLATE INTEGRAL WITH THE CYLINDER CONTACTING THE OUTER SURFACE OF THE DOOR, A BOLT SLIDABLY CONTACTING THE MOUNTING PLATE AND MOUNTED FOR ROTATION RELATIVE THERETO, A TUMBLER LOCK MOUNTED WITHIN THE CYLINDER AND RETAINING THE BOLT ON THE MOUNTING PLATE AND A SINGLE MOUNTING SCREW INSERTABLE INTO ALIGNED OPENINGS IN THE MOUNTING PLATE AND THE DOOR, SAID BOLT HAVING LOCKING ENGAGEMENT WITH THE STRIKE ON THE ENCLOSURE. 